Guitar amplifier



FIG. 1 is a perspective view of the front, top and right side of a guitar amplifier according to a first embodiment showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a perspective view of the front, top and right side of a guitar amplifier according to a second embodiment showing my new design;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a left side view thereof;

FIG. 12 is a right side view thereof;

FIG. 13 is a top plan view thereof; and,

FIG. 14 is a bottom view thereof.

The broken line showing of the guitar amplifier is included for the purpose of illustrating portions of the guitar amplifier and forms no part of the claimed design. 

CLAIM The ornamental design for a guitar amplifier, as shown and described. 